Beth Van Hoesen (June 27, 1926-November 26, 2010) was an American artist best known for her prints and drawings of animals and botanical subjects. In 1953, she married fellow artist Mark Adams.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Beth_Van_Hoesen

Mark in Front of Self-Portrait by Beth Van Hoesen
1966 / Graphite on cream wove paper / 14″x12-3/4″ / Art Institute of Chicago, IL

Beth Van Hoesen on Artnet: http://www.artnet.com/artists/beth-van-hoesen/

Further reading:
https://www.annexgalleries.com/artists/biography/2426/Van%20Hoesen/Beth
https://art.famsf.org/beth-van-hoesen
http://www.quailbellmagazine.com/the-real/beyond-art-beth-van-hoesens-boots